Megalis 10 mg is a generic medication manufactured by Macleods Pharmaceuticals, containing Tadalafil as its active ingredient. It is primarily used to treat erectile dysfunction (ED) in men by increasing blood flow to the penis during sexual stimulation. Additionally, it is used to manage pulmonary arterial hypertension (PAH) by relaxing the blood vessels in the lungs, reducing blood pressure in the pulmonary arteries.​